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Relativistic Calculation of the Width of the Theta (1540) Pentaquark

We calculate the width of the Theta(1540) pentaquark in a relativistic model in which the pentaquark is considered to be composed of a scalar diquark and a spin 1/2 triquark. We consider both positive and negative parity for the pentaquark. There is a single parameter in our model which we vary and which describes the size of the pentaquark. If the pentaquark size is somewhat smaller than that of the nucleon, we find quite small widths for the pentaquark of about 1 MeV or less. Our model of confinement plays an important role in our analysis and makes it possible to use Feynman diagrams to describe the decay of the pentaquark.

preprint2005arXivOpen access
Hu liC. M. ShakinXiangdong Li
hep-phhep-latnucl-th
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Hu liC. M. ShakinXiangdong Li

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